GNU Radio 2.x: gr_agc.h Source File

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# gr_agc.h

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    00001 /* -*- c++ -*- */
    00002 /*
    00003  * Copyright 2002 Free Software Foundation, Inc.
    00004  *
    00005  * This file is part of GNU Radio
    00006  *
    00007  * GNU Radio is free software; you can redistribute it and/or modify
    00008  * it under the terms of the GNU General Public License as published by
    00009  * the Free Software Foundation; either version 2, or (at your option)
    00010  * any later version.
    00011  *
    00012  * GNU Radio is distributed in the hope that it will be useful,
    00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
    00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    00015  * GNU General Public License for more details.
    00016  *
    00017  * You should have received a copy of the GNU General Public License
    00018  * along with GNU Radio; see the file COPYING.  If not, write to
    00019  * the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
    00020  * Boston, MA 02111-1307, USA.
    00021  */
    00022
    00023 #ifndef _GR_AGC_H_
    00024 #define _GR_AGC_H_
    00025
    00026 #include <math.h>
    00027
    00034 class gr_agc {
    00035
    00036  public:
    00037   gr_agc (float rate = 1e-4, float reference = 1.0, float gain = 1.0)
    00038     : _rate(rate), _reference(reference), _gain(gain) {};
    00039
    00040   float rate () const      { return _rate; }
    00041   float reference () const { return _reference; }
    00042   float gain () const      { return _gain;  }
    00043
    00044   void set_rate (float rate) { _rate = rate; }
    00045   void set_reference (float reference) { _reference = reference; }
    00046   void set_gain (float gain) { _gain = gain; }
    00047
    00048   float scale (float input){
    00049     float output = input * _gain;
    00050     _gain += (_reference - fabsf (output)) * _rate;
    00051     return output;
    00052   }
    00053
    00054   void scaleN (float output[], const float input[], unsigned n){
    00055     for (unsigned i = 0; i < n; i++)
    00056       output[i] = scale (input[i]);
    00057   }
    00058
    00059  protected:
    00060   float _rate;                  // adjustment rate
    00061   float _reference;             // reference value
    00062   float _gain;                  // current gain
    00063 };
    00064
    00065 #endif /* _GR_AGC_H_ */